ATI RN
Cardiovascular System Multiple Choice Questions Questions
Question 1 of 5
The cardiac output is determined by:
Correct Answer: D
Rationale: Cardiac output (CO = HR × SV) is determined by all listed factors : heart rate (A), preload (B) affects stroke volume (SV), afterload (C) resists SV, and myocardial contractility (D) influences SV. All contribute to CO.
Question 2 of 5
Explain the reason there is a delay in processing the electrical signal from the AV node to the AV bundle. To:
Correct Answer: A
Rationale: The AV node delays the impulse (~0.1s) to allow atrial contraction to finish filling ventricles before ventricular systole (A). B occurs naturally, C is due to Purkinje fibers, and D is unrelated.
Question 3 of 5
The cardiac control center (cardioregulatory center) is located in the
Correct Answer: C
Rationale: The cardioregulatory center in the medulla oblongata (C) controls heart rate via autonomic signals. The atrium (A) has the SA node, hypothalamus (B) regulates other functions, and carotid artery (D) has baroreceptors.
Question 4 of 5
The fluid that surrounds the cells of the body is called:
Correct Answer: D
Rationale: Tissue fluid (D), or interstitial fluid, surrounds cells, derived from plasma (C) leaking from capillaries. Blood (A) is in vessels, lymph (B) is in lymphatic vessels.
Question 5 of 5
The respiratory pump ___ the pressure difference between the abdominal region and the thoracic region thus leading to a(n) ___ in venous return.
Correct Answer: D
Rationale: The respiratory pump increases the thoracoabdominal pressure gradient (D) during inspiration (low thoracic pressure), enhancing venous return to the heart.